(Solved): a) Find the equivalent resistance of the combination of resistors shown in the figure above. R1= ...

a) Find the equivalent resistance of the combination of resistors shown in the figure above. ${\mathrm{R}}_1=3?,{\mathrm{R}}_2=3?,{\mathrm{R}}_3=4?,{\mathrm{R}}_4=2?$ and ${\mathrm{R}}_5=7?$. $?$ b) If a potential difference of $20\mathrm{V}$ is applied across points $\mathrm{a}$ and $\mathrm{b}$, find the potential difference across ${\mathrm{R}}_3$. $\mathrm{V}$ Note: You can earn partial credit on this problem. You have attempted this problem 0 times. You have unlimited attempts remaining.